Figure 1.

Timing of influenza vaccination and laboratory-confirmed influenza illness among pregnant women in Lima during 2018.

Note: 74% of reverse-transcription polymerase chain reaction (RT-PCR)-confirmed influenza illnesses in the cohort occurred between March 23 through June 22. During this period, only 17% of the participants (36% of those who were vaccicnated during the follow up) had been vaccinated with the current influenza vaccine.